Leases - Lease Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Lease Assets and Liabilities [Line Items]
Financing lease right of use assets - third party	$ 72.6	$ 80.4
Lease, Right-of-Use Asset	1,270.4	1,487.7
Operating Lease, Liability, Current	154.2
Current finance lease liabilities	11.9	14.4
Operating Lease, Liability, Noncurrent	1,041.7
Long-term financing lease liabilities - third party	63.7	68.3
Total lease liabilities	1,271.5	1,487.9
Third Party Lease [Member]
Lease Assets and Liabilities [Line Items]
Lease right of use assets - affiliate	668.4	836.3
Operating Lease, Liability, Current	66.1	78.3
Operating Lease, Liability, Noncurrent	600.4	755.9
Lease with Affiliate [Member]
Lease Assets and Liabilities [Line Items]
Lease right of use assets - affiliate	529.4	571.0
Operating Lease, Liability, Current	88.1	85.6
Operating Lease, Liability, Noncurrent	$ 441.3	$ 485.4